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Posts Tagged ‘Inspecting potable water storage’

Helpful USEPA Papers and Links

Here are three very helpful USEPA papers written by the Office of Ground Water and Drinking Water between 2002 and 2006.
Finished Water Storage Facilities August 15, 2002
Page 2
2.1.1 Sediment
Sediment accumulation occurs within storage facilities due to quiescent conditions which promote particle settling. Potential water quality problems associated with sediment accumulation include increased disinfectant demand, microbial growth, disinfection by-product formation, and increased turbidity within the bulk water. Instances of microbial contamination and disinfection by-product formation due to storage facility sediments are described in the Pathogen Contamination and Microbial Growth section and the Disinfection By-Product formation section, respectively.
Page 11
Comprehensive inspections are performed to evaluate the current condition of storage facility components. These inspections often require the facility to be removed from service and drained unless robotic devices or divers are used. The need for comprehensive inspections is generally recognized by the water industry. AWWA Manual M42 (1998) recommends that tanks be drained and inspected at least once every 3 years or as required by state regulatory agencies. Most states do not recommend inspection frequencies thereby leaving it to the discretion of the utility. States that do have recommendations are Alabama (5 years), Arkansas (2 years), Missouri (5 years), New Hampshire (5 years), Ohio (5 years), Rhode Island (external once per year; internal, every five years), Texas (annually), and Wisconsin (5 years). Kirmeyer et al. (1999) recommend that comprehensive inspections be conducted every 3 to 5 years for structural condition and possibly more often for water quality purposes.
Page 12
Kirmeyer et al. (1999) recommended that covered facilities be cleaned every three to five years, or more often based on inspections and water quality monitoring, and that uncovered storage Prepared by AWWA with assistance from Economic and Engineering Services, Inc. 12facilities be cleaned once or twice per year. Commercial diving contractors can be used to clean and inspect storage facilities that cannot be removed from service. AWWA Standard C652-92 provides guidelines for disinfection of all equipment used to clean storage facilities.
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On December 2006 Office of Ground Water and Drinking Water. Total Coliform Rule Issue Paper. Inorganic Contaminant Accumulation in Potable Water Distribution Systems.
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Health Risks from Microbial Growth and Biofilms in Drinking Water Distribution Systems June 17, 2002
Page 26
G. Sediment Accumulation
Significant microbial activity may occur in accumulated sediment (USEPA, 1992b). Organic and inorganic sediments can also accumulate in low-flow areas of the distribution system, and enhance microbial activity by providing protection and nutrients (USEPA, 1992b). Biofilms that slough can accumulate in the periphery of distribution systems leading to sediment accumulation and the proliferation of some microorganisms (van der Kooij, 2000). Sediments may be an important source of nutrients in open finished water reservoirs, by accumulating slowly biodegrading materials which are then broken down and released into the water column (LeChevallier, 1999b). The opportunities for biofilm development may be more abundant in storage tanks than in distribution system piping. Frequently, water is drawn from storage tanks only when water demand is high, such as during drought, fire flow, and flushing operations. This intermittent use results in prolonged storage times that may lead to increased sediment accumulation and lack of a disinfectant residual in the finished water storage vessel. Biological and aesthetic effects can be observed following the release of accumulated sediments from low flow areas of the distribution system (Geldreich, 1990).
Many studies have identified microbes in accumulated sediments, including both pathogens and non-pathogens. These include bacteria, viruses, protozoa, algae, fungi and invertebrates. Opportunistic pathogens that have been detected, and can multiply in sediments, include Legionella andmycobacteria (van der Kooij, 2000). Some primary pathogens can also survive for some time in sediments. Hepatitis A virus survived more than four months in sediments at both 5/C and 25/C (Sobsey et al., 1986). Other opportunistic pathogens found in sediments include Pseudomonas fluorescens and Flavobacterium spp. (Berger et al., 1993). Sediments can also release nutrients into the water which stimulate biofilm growth downstream (LeChevallier, 1999b).
Page 34
I. Proper Storage Vessel Management and Alteration
Proper storage vessel management and alteration, when necessary, can prevent contamination of the distribution system. Following TCR violations in 1996 in Washington D.C., one measure that proved effective in bringing the system back into compliance was the cleaning, inspection and disinfection of storage tanks and reservoirs (Clark, et al., 1999). To reduce pathogen presence and biofilm development, systems should have a scheduled program to rehabilitate all water storage facilities (USEPA, 1997). Proper operation and maintenance of storage tanks and reservoirs is listed as a BAT in the TCR (USEPA, 1992b). Storage tanks and standpipes should be pressure flushed or steam cleaned, then disinfected before returned to service (USEPA, 1992b), preferably with a disinfectant solution. This may not only remove microbial contamination from the vessel’s inner surface, but also nutrients that may be present. Proper operation of storage vessels can also reduce excessive residence times, which can lead to microbial survival and growth, and biofilm formation. Properly designed inlets and outlets, and the overall system design can improve problems caused by dead ends (Trussell, 1999). Pathogen contamination due to air introduction can be reduced by installing air filters to guard against pollution entering covered water reservoirs (USEPA, 1992b). Covering finished water reservoirs can protect against contamination from airborne sources, surface runoff, accidental spills and animals, such as insects and birds (USEPA, 1992b). EPA’s Uncovered Finished Water Reservoirs Guidance Manual describes recommended contamination control measures related to birds and other animals, human activity, algal growth and insects and fish (USEPA, 1999b). An understanding of the storage hydraulics and operation is important in reducing contamination of the finished water.
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If you need assistance inspecting or cleaning water storage tanks or towers call
Ron Perrin Water Technologies toll free at 1-888-481-1768.
For a fast quote Fax your tank information to 817-246-1740.
Or e-mail your tank information:
Out of Texas contact Robert at perrinsales@gmail.com
Texas Water Utilities please contact Debi Wheelan at tankinspections@aol.com
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CBS 11 i-Team watches as my company inspects and cleans a north Texas water tower.

November 20, 2014 Leave a comment

November 7th, 2014, Ginger Allen and the CBS 11 i-Team watches as my company inspects and cleans a north Texas water tower. The tower was cleaned as a normal maintenance procedure. A light- brown dusting of sediment was removed from the interior floor before it could get deep enough to support bacteria and become a problem.   OLYMPUS DIGITAL CAMERA The tower was cleaned by a Commercial Diver who was trained at OCEAN CORP, Houston, Texas. The Diver is sealed in his own environment, then washed down with a chlorine solution. Because we specialize in the inspection and cleaning of Potable Water Storage Facilities, all of our equipment is purchased for, and only used in, potable water. This utility is doing a great job of maintaining their system. However, utility managers across the country struggle to get the funds to properly maintain their systems. The EPA is currently considering a regulation that would require all water storage facilities to be inspected and cleaned at regular intervals. This new requirement could improve the water quality for millions of Americans.

Ron Perrin Speaks to News Crew

Ron Perrin Speaks to News Crew

The EPA is taking comments on this proposed regulation until the end of the year. We have the contact information posted on our blog, or you can just take our poll at: www.cleanwatertankproject.com. The poll results will be turned in to the EPA at the end of the year.

CBS 11 I-Team Looks At What’s In Your Water Tower

 

 

Chick here to see video Video

http://launch.newsinc.com/embed.html?type=VideoPlayer/Single&widgetId=1&trackingGroup=69016&siteSection=ndn&videoId=28175822

The Written article is here:

http://dfw.cbslocal.com/2014/11/19/watertowers/http://dfw.cbslocal.com/2014/11/19/water-towers/

—–Photos taken by RPWT Office Manager Debi Wheelan

Robert Perrin on com bot talking to the diver

Robert Perrin on com bot talking to the diver

Find us on FACEBOOK  or connect with Ron on Linked-In AND PLEASE SHARE THIS POST AND THE CBS NEWS STORY WITH YOUR FRIENDS EVERYONE DESERVES TO HAVE CLEAN SAFE TAP WATER, Take the Poll at www.cleanwatertankproject.com and we can make this happen!

Now we can add a brain-eating amoeba to the list of contaminants that can be in tank sediment

August 27, 2014 Leave a comment

By Ron Perrin

Removing sediment from the floor of your water tanks and towers may also be removing the habitat that allows bacteria, protozoa and viruses from getting a foothold in your distribution system. Now we can add a brain-eating amoeba to the list of contaminants that the sediment on the floor of your water storage tank can support.

Sediment being Removed from water storage tank

Sediment being Removed from water storage tank

September 16, 2013, NBC News reported: “Deadly brain amoeba infects US tap water for the first time”. The death of a 4-year-old boy near Violet, LA., was linked to the Naegleria fowleri amoeba. The child had been playing on a backyard slip-n-slide that used water from the St. Bernard Parish water system, that was later found to be contaminated with the amoeba. “Tests show it’s present throughout the water supply system in St. Bernard Parish, directly southeast of New Orleans.”

According to the CDC: “Naegleria fowleri (commonly referred to as the “brain-eating amoeba” or “brain-eating ameba”), is a free-living microscopic ameba, (single-celled living organism). It can cause a rare and devastating infection of the brain called primary amebic meningoencephalitis (PAM). The ameba is commonly found in warm freshwater (e.g. lakes, rivers, and hot springs) and soil. Naegleria fowleri usually infects people when contaminated water enters the body through the nose. Once the ameba enters the nose, it travels to the brain where it causes PAM, which is usually fatal. Infection typically occurs when people go swimming or diving in warm freshwater places, like lakes and rivers. In very rare instances,Naegleria infections may also occur when contaminated water from other sources (such as inadequately chlorinated swimming pool water or heated and contaminated tap water) enters the nose. You cannot get infected from drinking water contaminated with Naegleria.”

The CDC also tested nearby DeSoto Parish Waterworks Dist. #1 because it was the near the site of an infection that happened in 2011 from non-potable water (lake or river, etc.). On October 8, 2013, The CDC confirmed the presence of the rare amoeba in five locations in DeSoto Parish Waterworks Dist. #1.

Heat is also a factor, an increase in only ten degrees can double the speed of bacteria growth. As record high temperatures become more common in summer months we see that keeping water distribution tanks free of sediment build up may be more important than ever before. Removing the sediment from your water tank may prevent a disaster before it can ever start.

The new Revised Total Coliform Rule (RTCR) will be fully implemented in 2016. It requires assessment and corrective action when there are indications of coliform contamination. The RTCR no longer includes a monthly maximum contaminant level violation for multiple total coliform detections. Instead, systems that have indicators of coliform contamination in the distribution system must assess the problem and take corrective action.  Well documented tank inspections should be part of assessing your problem.  If there is sediment build up in the tank, cleaning would be a logical corrective action to take.

The fact is, keeping your tanks clean may also prevent you from getting an RTCR violation in the first place. What we have found is this: Once the sediment is removed, our utility customers discover that chlorine costs are reduced because the chlorine is no longer losing the war with the microbes that were growing in the sediment.

However you choose to do it, just get it done. Do not let it go year after year, out of sight and out of mind.   Knowing what is in your facilities with a good inspection is your first line of defense.  If an accumulation of sediment is found, don’t think of it as “just a little dirt.” Know that it is a broken barrier that can allow contaminants to compromise the entire water supply and the health of the community

About the Author:
CSHO LOGORon Perrin is a Certified Safety and Health Official (CSHO), a member of the Texas Water Utilities Association, AWWA,

Ron Perrin Owner of Ron Perrin Water Technologies

Ron Perrin Owner of Ron Perrin Water Technologies

and the owner of Ron Perrin Water Technologies in Fort Worth, Texas. Since 1997 his company has inspected over seven thousand water storage tanks and towers in 14 states. Ron may be contacted through his web site at http://www.ronperrin.com.
Or contact RPWT Office Manager Debi Wheelan:
tankinspections@aol.com

Call: 817-377-4899

Fax 817-246-1740

June 2013 Test of New Remotely Operated Vehicle for Tank Inspections

June 19, 2013 Leave a comment

Our first use of the DEEP TREKKER ROV was successful.   We were able to get to the back of a 500,000 gallon potable water storage tank and see sediment level and interior conditions of roof support Columbus and walls.   The second inspection we did was on a one million gallon ground storage tank. We added a safety rope to protect the tether and found the lighting system caused a little bit of glare when we went into darker parts of the tank, but it was reduced when we got closer to the inspection points we needed to look at. Overall, we found it to be a very good inspection tool!

To learn more about what may be in potable water tanks and towers visit:

“THE CLEAN WATER TANK PROJECT”

For more information on RON PERRIN WATER TECHNOLOGIES click here or visit www.ronperrin.com

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WHAT IS IN YOUR POTABLE WATER STORAGE TANKS AND TOWERS?   Do you need a Potable water tank or tower inspected?

Our inspection methods offer the most information for the least cost,  all of our inspection methods include an underwater DVD

allowing you to see what is in your storage tanks.  Remote video camera, ROV or potable water diver we have a method for every budget or need.

Call us toll free at 888-481-1768 or simply fill out the form below:

Responsible for a water system in Florida?

In Florida vent screens and hatches are required to be inspected once a year but the FLorida DEP requires that a licensed engineer inspect each Florida water storage facility at least once every five years.

Ron Perrin Water Technologies offers stat of the art underwater inspections that allow you to keep your system in service during the inspection.  This saves you time water and money.  Our dive team can also clean your water tanks with minimal water los and little if any disruption.

Visit our web site for more information at: www.ronperrin.com

The Rule:

62-555.350 Operation and Maintenance of Public Water Systems.

(1) Suppliers of water shall operate and maintain their public water systems so as to comply with applicable standards in Chapter 62-550, F.A.C., and requirements in this chapter.

(2) Suppliers of water shall keep all necessary public water system components in operation and shall maintain such components in good operating condition so the components function as intended. Preventive maintenance on electrical or mechanical equipment – including exercising of auxiliary power sources, checking the calibration of finished-drinking-water meters at treatment plants, testing of air or pressure relief valves for hydropneumatic tanks, and exercising of isolation valves – shall be performed in accordance with the equipment manufacturer’s recommendations or in accordance with a written preventive maintenance program established by the supplier of water; however, in no case shall auxiliary power sources be run under load less frequently than monthly. Accumulated sludge and biogrowths shall be cleaned routinely (i.e., at least annually) from all treatment facilities that are in contact with raw, partially treated, or finished drinking water and that are not specifically designed to collect sludge or support a biogrowth; and blistering, chipped, or cracked coatings and linings on treatment or storage facilities in contact with raw, partially treated, or finished drinking water shall be rehabilitated or repaired. Finished-drinking-water storage tanks, including conventional hydropneumatic tanks with an access manhole but excluding bladder- or diaphragm-type hydropneumatic tanks without an access manhole, shall be checked at least annually to ensure that hatches are closed and screens are in place; shall be cleaned at least once every five years to remove biogrowths, calcium or iron/manganese deposits, and sludge from inside the tanks; and shall be inspected for structural and coating integrity at least once every five years by personnel under the responsible charge of a professional engineer licensed in Florida.

Warranty Inspections

November 17, 2008 Leave a comment

Warranty Inspections:

 

Our inspections are a valuable tool when used while your tank is still in warranty after construction or after a painting contract has been completed.  Allowing a painting contractor to perform his own warranty inspection is a little like hiring a fox to guard a hen house.  If he just did the painting it is in his best interest to tell you everything is ok.

 

Good or bad our report will show you what is going on inside and outside your tank, we cover it top to bottom.

 

Painting contractors offering low cost inspections are not much better.  It is their job to find work so they cam make tens or hundreds of thousands of dollars contracting a paint job on your water tank or tower.

 

We do not paint tanks.  Ron Perrin Water Technologies inspects and cleans water storage tanks & towers.   We are the perfect company for a third party inspection.  Have you been told your paint is too thin?  We can take DFT (Dry Film Thickness Test) reading on your tank from top to bottom, upon request.  Our photos show you what is going on.  If you have peeling paint or surface corrosion a photograph is truly worth a thousand words.

If you do not have a problem you may be able to go several more years before investing in an expensive painting contract.  Either way the information provided in our annual inspection reports is worth its weight in gold and meets all requirements for your

TCEQ required annual inspection.

 

Call today our inspection reports start at only a few hundred dollars.

 

We include:

A detailed written report including digital photography

Narrated underwater video documenting interior conditions and sediment levels

Dry Film Thickness Testing  (DFT) in nine locations unless more are requested.

One Million Dollars general liability policy, workers comp., and vehicle insurance.

 

Visit www.ronperrin.com 

 

Call toll free today for your no obligation proposal.  1-888-481-1768